Class: XFS::BmapBTreeBlock

Inherits:
Object
  • Object
show all
Defined in:
lib/fs/xfs/bmap_btree_block.rb

Overview

//////////////////////////////////////////////////////////////////////////// // Class.

Constant Summary collapse

XFS_BTREE_LONG_PTRS = 
1
XFS_BMAP_MAGIC = 
0x424d4150
XFS_BMAP_CRC_MAGIC = 
0x424d4133

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(buffer, sb) ⇒ BmapBTreeBlock

Returns a new instance of BmapBTreeBlock.



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 83

def initialize(buffer, sb)
  @sb = sb
  if defined? XFS_BTREE_LONG_PTRS
    if @sb.version_has_crc?
      @btree_block = BTREE_BLOCK_LONG.decode(buffer)
    else
      @btree_block = BTREE_BLOCK_LONG_NOCRC.decode(buffer)
    end
  else
    if sb.version_has_crc?
      @btree_block = BTREE_BLOCK_SHORT.decode(buffer)
    else
      @btree_block = BTREE_BLOCK_SHORT_NOCRC.decode(buffer)
    end
  end
  @header_size   = btree_block_length
  @number_records = @btree_block['num_recs']
  @level         = @btree_block['level']
  raise "Invalid BTreeBlock" unless (@btree_block['magic_num'] == XFS_BMAP_MAGIC) ||
                                    (@btree_block['magic_num'] == XFS_BMAP_CRC_MAGIC)
  @left_sibling  = @btree_block['left_sibling']
  @right_sibling = @btree_block['right_sibling']
  @buffer        = buffer
end

Instance Attribute Details

#buffer ⇒ Object (readonly)

// initialize



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 81

def buffer
  @buffer
end

#header_size ⇒ Object (readonly)

// initialize



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 81

def header_size
  @header_size
end

#left_sibling ⇒ Object (readonly)

// initialize



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 81

def left_sibling
  @left_sibling
end

#level ⇒ Object (readonly)

// initialize



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 81

def level
  @level
end

#number_records ⇒ Object (readonly)

// initialize



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 81

def number_records
  @number_records
end

#right_sibling ⇒ Object (readonly)

// initialize



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 81

def right_sibling
  @right_sibling
end

Instance Method Details

#btree_block_length ⇒ Object 



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# File 'lib/fs/xfs/bmap_btree_block.rb', line 108

def btree_block_length
  if defined? XFS_BTREE_LONG_PTRS
    if @sb.version_has_crc?
      len = SIZEOF_BTREE_BLOCK_LONG
    else
      len = SIZEOF_BTREE_BLOCK_LONG_NOCRC
    end
  else
    if @sb.version_has_crc?
      len = SIZEOF_BTREE_BLOCK_SHORT
    else
      len = SIZEOF_BTREE_BLOCK_SHORT_NOCRC
    end
  end
  len
end